Anode assembly mechanism



Dec. 5, 1961 K. M. SPENCER ANODE ASSEMBLY MECHANISM Filed April 22, 1959 :9.5. 3 23 23 67g 73 as 6285 4 L F66 k l 24 EHI* 615% wl 26 I l k lg 62 f6 a i 6% v I l I it 60 E 74 l 66 76 76 66 66 60 i 4 INVENTOR.

Eelzgw M. Spezwer MaJ/? ATTORNEY United States Patent() 3,012,169 ANODE ASSEMBLY MECHANISM Kenneth M. Spencer, Galeton, Pa., assigner to Sylvania Electric Products Inc., a corporation of Delaware 'Y Filed Apr. 22, 1959, Ser. No. 808,145 4 Claims. (Cl. 313-288) The invention relates to anode assembly mechanism and i particularly to mechanism for applying an insulating washer to an anode. The invention also relates'to an anode assembly structure produced by the mechanism.

It is an object of the invention to make the assembly portion on the exterior of the anode, the anode being p formed like a tbimble, and the washer was held against movement longitudinally ofthe anode, in a direction away from the shoulder, by clips welded onto the anodeand pressing against the mica on the face opposite to that 3,012,169 Patented Dec. 5, 1961 40 at its upper end and a uid pressure inlet `427.1atV its lower end. The inlet of fluid, as compressed air may be under control of a foot controlled valve 43 and the cylinder may be provided with a bleeder port 44. A piston 45 is normally held to the lower end of the cylinder by a compression spring 46 reacting between the toprorf the piston and the opposing wall of thecylinder. The spring surrounds a piston rod 48 fastened to the piston and on the upper end of the rod is secured a magnetized plunger 50 of cylindrical form and provided with a truucated conical tip 52. The plunger passes through a circular opening 54 in a xed support plate 56, which plate is connected, as by struts 58, with the base 30. The plate 56 has an upstanding circular collar 68 surrounding the opening and around the outside of the collar is snugly tclescoped the inverted thimbleor anode 16 ready for securement of the insulating washer 24 thereto. The inside of the collar is shouldered as at 62 to lixedly receive the tool support cylinder'64 preferably made of a non magnetic material. vThis cylinder is slotted as indicated at 66, there being four slots disposed 90 apart, the slots running vertically of the ycylinder from near its v bottom all the way up to and through the top edge.` IIn bearing against the shoulder. With the assembly mechaf nism of this invention it is possible to Vdispense with the clips and a simple expedient is employed for holding a washer against its shoulder on the anode. This is etfected by placing dimples in the inner face of the anode immediately above the washer, which forms extrusions or nubbins on the outer face of the anode, the washer being securely held between the shoulder and the nubbins.

For a clearer understanding of the invention, attention is directed to the following specification and claims, in conjunction with the accompanying drawing in which:

FIG. l is a view of a tube in which the anode and insulator spacer are assembled by the simple assembling device disclosed herein. y

FIG. 2 is a cross section through the assembling device together with the anode and its associated insulating washer.

FIG. 3 is a section on the line 3-3 of FIG. 2 with the washer removed.

FIG. 4 is a fragmentary view as viewed along the line 4 4 of FIG. 2.

Referring to the drawings in greater detail, in FIG. 1 is depicted a type of rectier 10 employing a heated filamentary type of cathode 12, connected by leads to proper pins 14 in the base of the tube, an anode thimble 16, a lead 18 fast with the anode, sealed in the dome 19 of the tube and connected to the anode terminal cap 20 of the tube. FIG. l also shows the insulating members as of mica, 22 and 24, the members 22 serving as a shield to prevent too free getter splash and the member 24 serving to space the anode from the enclosing glass bulb 25.

The mica 22 rests on four equally spaced nibs 23 arranged circumferentially on the top of the anode, while the mica 24 rests on a shoulder 26 formed on the cylindrical wall of the anode, the anode above the shoulder being of slightly less diameter than the portion at and below the shoulder. Above the mica 24 are four equally spaced protruberances or nubbins 28 at such a height above the shoulder that the mica will be held rmly against the shoulder by these nubbins.

ln FIG/2 and in the sectional views is clearly shown the mechanism for securing together the insulator 24 and the anode 16.

On a base 39 is mounted a fluid motor 32 whose cylinder 34 is provided with flanges 36 fastened to the base by bolts 38. The cylinder is provided with an exhaust duct plunger.

order to rigidity the thus split cylinder there is brazed to its upper edge the downwardly turned ange 68 of a brass ring 78 the ring havingy a central opening 72 to facilitate disassembly 'of the device. The cylinder, about Vone third of the way up from itsbottom' edge, is provided with a peripheral groove 74 in which is positioned a resilient split ring 76 to form a pivot arrangement for four nubbing tools 7S riding in the slots 66. Each tool has a notch 80 cut therein to rest on and against the ring 76.

` The tool at its upper end has a sharp nose 82 which when pressed against the inner wall of the anode will form an indentation or dimple therein creating the nubbin 28 on the exterior 0f the anode immediately above the washer. The opposite face of the tool 78 has a bevelled face 84 cooperating with the truncated conical tip 52 of the Furthermore each tool is formed with an upwardly extending projection to engage the inner anged wall of the ring 7 0 to thus limit outward displacement of thernoses. The tools are made of paramagnetic material as soft iron with hardened noses so that as the magnetized plunger is withdrawn, the tools will pivot about the ring 76, the bevelled faces 84 clinging to the conical tip. The tools are recessed on the faces closest to the plunger intermediate the length of the tools so as toleave a space between the intermediate portions of the tools and the plunger. Instead of the plunger being permanently magnetized and the tools non magnetized, but magnetic, the reverse may be true with equally good results.

In operation, an operator will seat an anode thimble on the plate 56 and about the collar 68. Next he will place a washer 24, as of mica, on the shouldered portion 26 of the anode. Then, by depressing his foot on the stem of the valve 43, the valve will be opened to apply fluid pressure to the piston 44 to drive the plunger upwardly to the position shown in F162. During the upward movement, the plunger will have moved the upper ends of the tools 78 outwardly, forming the nubbins 28 on the anode which will cooperate with the shouldered portion 26 thereof to lock the washer 24 in place. On release of foot pressure, the luid will vent from beneath the piston and the spring 46 will force the plunger 50 downward. The magnetic attraction between the plunger and tools will draw the tools inwardly of the cylinder allowing easy removal of the anode and insulator assembly. l

What is claimed is:

l. A device for forming nubbins on anodes to secure an insulating washer onto a shouldered portion of the anode comprising an apertured plate, a collarv on said plate surrounding the aperture, said collar being adapted r Vto center an anode resting on said plate, a tool supporting cylinder mounted on said collar, said cylinder being vertically slotted, a tool providedwith a nose projectible through the slot, said tool having a bevelledface extending inwardly ofY the cylinder, and a plungermovable through the collar having an inclined'upper-endto engage the bevelled face on the tool in order to force the nose through the slot and into the anode wall above the Washer on the shouldered portion of the anode to secure the washer to the anode.

2. A device for forming nubbins on anodes to secure an insulating washer onto a shouldered portion of the anode comprising an apertured plate adapted to support an anode, a vertically slotted cylinder on said plate surrounding the aperture in the plate, a ring around the cylinder and held to the cylinder, said ring traversing the slotted portion of the cylinder, a toolA movable in saidvslotted portion and pivoted on said ring, said -tool having a nose portion projectible through the slot and adapted to engage and indent the anode above the washer, saiclY tool on the face thereof opposite to the nose having a bevelled face, and a plunger movable through the aperture in the plate, said tool having a tip portion engaged with the bevelled face to pivot the -tool about the ring as the plunger is translated.

3. A device to secure a washer on an anode where the washer rests on a projecting portion of the anode, said device comprising an aperturedY plate, a -vertical collar forming part of the plate4 and surrounding the aperture, said collar adapted to center the anode on the plate, a vertically slotted cylinder fastened to the collar, a ring surrounding the cylinder and traversing the slots in the cylin der, tools pivotally mounted on the ring and riding 1n v the slots of the cylinder said tools being pivoted near their lower ends and provided on their upper ends with, irst, sharp pointed noses projectible toward the anode and second, with bevelled faces projecting into the cylinder, a vertically translatable plunger movable longitudinally of the cylinder, said plunger at its upper end having a truncated conical tip, one of said plunger and tools being permanently magnetized and the other being of magnetizable material, and means for moving said plunger.

4.An electron tube anode and washer assembly comprising an anode having two cylindrical portions of different diameters forming a shouldered portion between said two diametered portions, an insulating washer seated on said shoulder, said washer having an internal diameter smaller than the larger diametered portion of said'anode and fitting snugly about the smaller diametered portion of the anode, and nubbins in the anode above the washer engaging the seated Washer, to hold the washer in place.

References Cited in the le of this patent UNITED STATES PATENTS 2,064,485 Miller Dec. 15, 1936 2,243,496 Boote May 27, 1941 2,586,946 Haas Feb. 26, 1952 FOREIGN PATENTS '28,349 Great Britain Nov. 9, 1911 

